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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44d51d0800e80d7c0c005dcdb5ae31e1aad69fde54acd962a75a682828c62800' 
  AND token = '4kcQCj5LLLWRW4XFq1cszc34F7Zji2whJA51dzUQGOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}